Paper/patches/api/0097-EndermanEscapeEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 30 Apr 2018 13:14:30 -0400
Subject: [PATCH] EndermanEscapeEvent

Fires an event anytime an enderman intends to teleport away from the player

You may cancel this, enabling ranged attacks to damage the enderman for example.

diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..f6be848c44d5efaca3fbc03c3be7451411943c24
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
@@ -0,0 +1,86 @@
+package com.destroystokyo.paper.event.entity;
+
+import org.bukkit.entity.Enderman;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+public class EndermanEscapeEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    @NotNull private final Reason reason;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public EndermanEscapeEvent(@NotNull Enderman entity, @NotNull Reason reason) {
+        super(entity);
+        this.reason = reason;
+    }
+
+    @NotNull
+    @Override
+    public Enderman getEntity() {
+        return (Enderman) super.getEntity();
+    }
+
+    /**
+     * @return The reason the enderman is trying to escape
+     */
+    @NotNull
+    public Reason getReason() {
+        return this.reason;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    /**
+     * Cancels the escape.
+     * <p>
+     * If this escape normally would of resulted in damage avoidance such as indirect,
+     * the enderman will now take damage.
+     */
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    public enum Reason {
+        /**
+         * The enderman has stopped attacking and ran away
+         */
+        RUNAWAY,
+        /**
+         * The enderman has teleported away due to indirect damage (ranged)
+         */
+        INDIRECT,
+        /**
+         * The enderman has teleported away due to a critical hit
+         */
+        CRITICAL_HIT,
+        /**
+         * The enderman has teleported away due to the player staring at it during combat
+         */
+        STARE,
+        /**
+         * Specific case for {@link #CRITICAL_HIT} where the enderman is taking rain damage
+         */
+        DROWN
+    }
+}